Table 8.1. Troubleshooting Guide
Problem | Possible Causes | Solution |
---|---|---|
Signature Bytes read as 0x00 0x00 0x00 | ISP Frequency is to high. | Lower ISP freq under the board settings |
Not able to communicate with device through debugWIRE | RESET pullup resistor to small | Remove or increase the pull-up value to 10K ohm or more. |
Not able to communicate with device through debugWIRE | Decoupling Capasitor destroys communication on RESET line | Remove Decoupling capasitor on reset line during debugWIRE emulation |
debugWIRE communication fails when using STK500 | RESET line strongly tied to VCC | Remove RESET jumper on STK500 to allow AVR Dragon to control the line. |
After successfully enabling the DWEN fuse, AVR Dragon is not able to enter debug mode | RESET line strongly tied to VCC | Remove RESET jumper on STK500 to allow AVR Dragon to control the line. |
Target voltage is read as 0V for on-board targets | AVR Dragon get no reference voltage to the target voltage sensing. Target voltage is sensed from either pin 2 on ISP header or pin 4 on the JTAG header. | In order to get reference voltage to the level converters of AVR Dragon, connect Pin 2 or 4 or 6 on the VCC header to pin 2 on ISP header or pin 4 on the JTAG header. Note that VCC pins on AVR Dragon are set to 5V and this procedure should therefore not be used for off-board targets. |
Target voltage is read as 0V for off-board targets. | AVR Dragon get no reference voltage to the target voltage sensing. Target voltage is sensed from either pin 2 on ISP header or pin 4 on the JTAG header. | Connect the target voltage from the target board to pin 2 on ISP header or pin 4 on the JTAG header. |
Not able to set ISP frequency | AVR Dragon is not reading any target voltage. | See above |
ISP/PP/HVSP programming fails | AVR Dragon is not reading any target voltage | See above |
Not able to connect to AVR Dragon, and status led is yellow | AVR Dragon firmware upgrade failed, or firmware is corrupt. | Go to the menu "Tools->Upgrade AVR Dragon" to perform a manual upgrade. |